Side seam for metal can bodies



Jan. 25, 1938. w PUNTE I SIDE SEAM- FOR METAL CAN BObIES Filed Aug. 12,1935 l mh Fl L rlL n EL L ff Patented Jan. 25, 1938 f 2,106,656

UNITED STATES PATENT OFFICE William F. Punte, Syracuse, N. Y., assignorto Continental Can Company Ina, New York, N. Y., a corporation of NewYork I Application August 12, 1935, Serial No. 35,864

1 Claim. (01. 220-76) I The invention relates to new and usefulimnotched at l, l, and folded back along the line provements in metalcan bodies and more parb-,b to form hooks 8, 8, and abutment membersticularly to the'interlocking parts of the side 9, 9. The hooks 8, 8 andmembers-'9, 9, are proseam. portioned the same as the hooks 5, and mem 5An object of the invention is to provide a side bers 6, 6, respectively.When the edges of the 5 seam wherein the edges of the body blankare bodyblank arejoined, the hooks 5, 5 and 8, 8, united by alternately disposedhook section and interlock as shown in Figure 5, while the mem-. lapsection so constructed that the raw edges of hers 6,' 6, and'9, 9, abutas shown in Figure 4. the metal in the lap sections are concealed within'The bumping irons are preferably so shaped that 10 the side seam.. thebody portion carrying the abutment members 10 A further object oftheinvention is toj provide 6, 6, is forced outwardly as indicated in Fig.4 a side seam of the above type wherein he metal and by the shade linesin 'Fig. 3. This brings partsforming the side seam are so constructedthe members 6, 6, and 9, 9, into alinement and that the seam as viewedfrom the outside is vuniabutting relation; while the body portion at theform throughout the entire length-thereof. outside of the seam isuniform and without de- 15 A still further object of the invention istopropression throughout its entire length. vide a side seam of the abovetype wherein the The side seam thus formed includes hook secedgeportions of the lap section are so disposed tions which interlock in theordinary way, and as to mechanically-resist the shearing Strain on lapsections wherein the metal is folded back to m the solder'bond in saidlap sections. provide abutment members and to conceal the In the drawingraw edges of the metal. These hook sections Figure 1 is a plan view of abody blank embodyand lap sections are relatively short and alter-- ingthe improvements; v nately arranged.

Figure 2 is a view from the inside of thecan of A solder bond is appliedto the outside of the Figure '3 is a view similar to Fig. 2, with thecapillary attraction to the uttermost parts of the hooks interlocked andthe seam bumped and side seam. Any gases forming in advance of thesolder bonded; flowing solder will escape between the abutted Figure 4isa sectional view on the line 4-4 of ends of the lap sections and fromsaid lap sec- 4 Fig. 3; tions. Likewise, the solder will flow betweenthe 30 Figure 5 is a sectional view on the line-5-5 of ends of theabutted members and-find a shorter Fig. 3. path tothe inner extremity ofthe side seams.

In the carrying out of the invention a body The solder bond thus formedis indicated at IU blank of suitable size to form a single can body inthe drawing.

.3 the body blank before the hooks are joined; seam and the moltensolder will flow freely by 25 is cut from sheet metal after which it isnotched Certain products when hermetically sealed in a 35- and the edgesshaped for joining. In Figure 1 can and treated create an internalpressure which of the drawing such a body blank is indicated at is farabove the atmospheric external P su I. At the right of this figure theedge portion onthe can. This differential in pressure tends is slit at2, 2, adjacent each end to' provide the to bulge the can particularly inthe central re- 40'1ap sections 3, 3 whi h are of the. usual ohargion;In the hooksections there is a tendency 40 acter. At spaced intervalsthe edge portion is of the interlocked hooksto unfold witharesultingcutaway as indicatedat 4, 4. The ends of the rupture of the solder'bond,The folded back porcut-away portions are disposed at right angles totions of the lap sections are integral with the inner the edge of theblank and the inner side is parallel half ofv each hook and willrestrain and prevent to said edge. This edge portion is foldedback thisunfolding of the hooks. This internal pres- 45 along the broken line aato provide'hooks. 5, 5, sure produces a shearing strain on the lapsecsee Figs. 1, 2, and 5. The portions of-the body tions. The abuttedend of the folded back memblank between the books 5, 5 are also foldedback bers mechanically resist this shearing strain.

and form abutment members indicated at 6, 6.. From the above it will benoted that the lap Figures 1, 2, and 5. These abutment members sectionscooperate with the hook sections in re- 50 are substantially half thelength 'of the hooks 5, sisting, the unfolding force on the side seamdue5,.transversely of the side seam and-are preferably to internal pressureand the hook sections coopconsiderably wider than the hookslongitudinally erate with the abutted ends in .resisting the of the sideseam. I r shearing strain imposed upon the lap section.

'The other edge portion of the body blank is It is obviousthat changescan be made in the proportions and shaping' of the parts and also in thearrangement thereof, without departing from the spirit 'of the inventionas set forth in the appended claim. v

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, is:

A metal can body having its edges joined by a side seam includinginterengaging folded back portions which are spaced from each otherlengthwise of the seam and abutted back portions between theinterengaging portions, the portions of the can body in the region ofthe abutted folded back portions being bumped so as to contact with thefolded back portions and a solder bond uniting the contacting portionthroughout the entire limits of the side seam.

' WILLIAM F. PUNTE.

